stderr-tricks.rb

require 'rubygems'
require 'eventmachine'
require 'fcntl'


#$stderr.sync = true
#$stdout.sync = true
#
$r,$w=IO::pipe
$stderr.reopen $w
$stderr.write("bah\n")
puts $r.readline


module Handler
  def notify_readable
    puts $r.read
  end 
  #def receive_data data
  #  data
  #end
end


def set_nonblocking(io)
  val = io.fcntl(Fcntl::F_GETFL)
  return io.fcntl(Fcntl::F_SETFL, val | Fcntl::O_NONBLOCK)
end


set_nonblocking($r)


EM.run do
  EM.attach $r, Handler
  EM::PeriodicTimer.new(0.5) { $stderr.write("blah\n") }
  EM.add_timer(5) { EM.stop }
end